So I know there isn't any replacement interval for the timing chain and it doesn't need replacement unless something drastic goes wrong.
However I've heard/read of how timing chains usually have plastic guides that may break causing the chain to stretch. This would causing timing to be off and possibly the chain jump a gear tooth.
Does anyone know if the guides are plastic and what there reliability is? Or if there are any guides at all?
I've read how the 22R engine's plastic guides could break leading to problems I mentioned above and even wear through the cover b/c the stretched chain would hit against it, as well as valve damage from piston slap b/c off timing. The 3RZ isn't an interference engine though so know valve damage could occur but I suppose a stretched chain.